Template:Emissions parties overview
Some wiggliness with words here: in an Allowances Transaction one is either delivering Allowances, in which case you are the {{{{{1}}}|Seller}} of a Forward Sale Transaction, the {{{{{1}}}|Seller}} of a Call Option (i.e., you have the obligation to deliver Allowances when called) or the {{{{{1}}}|Buyer}} of a Put Option (i.e., you have the right to deliver {{{{{1}}}|Allowances}}), or you are receiving {{{{{1}}}|Allowances}}, in which case you are the {{{{{1}}}|Buyer}} under a Forward Purchase Transaction, the {{{{{1}}}|Buyer}} of a Call Option (i.e., you have the right to call for {{{{{1}}}|Allowances}} to be delivered to you) or you are the {{{{{1}}}|Seller}} of a {{{{{1}}}|Put Option}} (i.e., you have the obligation to take delivery {{{{{1}}}|Allowances}} when they are put to you).
The EFET Allowances Appendix prefers just Seller and Buyer and doesn’t really use the term “Delivering Party” or “Receiving Party” — except in a completely different context relating to tax, which is sort of stupid, , but the IETA Master Agreement and the ISDA EU Emissions Annex have a bob each way.